Add Scenario.getLanguage()

[antagoony]

🤔 What's changed?

Following the discussion of Getting knowledge about the current Locale within any custom @DefaultParameterTransformer I think this is the best solution to propose. It simply adds a getter-method to the current language value for Scenario (and necessarily for TestCase and TestCaseState). Doing so, any glue code class can provide a simple @Before method including a Scenario argument, and by this get access to the current language. In result, any transformer method (either @DefaultParameterTransformer, @DefaultDataTableEntryTransformer, @DefaultDataTableCellTransformer) or type method (@ParameterType, @DataTableType) can provide locale-aware behaviour. (An example is given within this comment.)

⚡️ What's your motivation?

See issue "Getting knowledge about the current Locale within any custom @DefaultParameterTransformer" (cucumber/cucumber-expressions#376).

🏷️ What kind of change is this?

• ⚡ New feature (non-breaking change which adds new behaviour)

♻️ Anything particular you want feedback on?

Please let me know, if you want me to add some documentation into section "Default Transformers" and/or section "Parameter Type" giving an example of a locale-aware type transform.

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

[mpkorstanje]

Oh this is a really elegant solution! Cheers!

Please let me know, if you want me to add some documentation into section "Default Transformers" and/or section "Parameter Type" giving an example of a locale-aware type transform.

That would be appreciated! Please do so on a separate pull request.